Piston-valve for engines.



(No Model.)

Patented Aug. I4, I900. C. D. P. GIBSON.

PISTON VALVE FOB ENGINES. 7

(Application filed Aug. 26, 1899.)

lvz'uenfar UNITED STATES PATENT UFFIGE.

CHARLES D. P. GIBSON, on JERsEY'oIrY, NEW JERsEY;

PISTON-VALVE FOR ENGINES;

$PECIFIGATION forming part of Letters Patent No. 655,929, dated August14, 190-5. Application filed August 28; 1899- Sei'lal No. 728,766. (Nomodel.)

To all whom, it may concern:

Be it known that I, CHARLES D. P. GIBSON, a citizen of the UnitedStates, residing at Jersey City, in the county of Hudson and State ofNew Jersey, have invented new and useful Improvements in Engines, ofwhich the following is a specification.

This invention relates to piston-valves for fluid-pressure engines, andembraces a construction of simple character, particularly adaptingvalves of the reciprocating class for use with the motive fluids underhigh pressure.

In the accompanying drawings, Figure 1 is a longitudinal sectional viewof so much of an engine as is necessary to illustrate my invention. Fig.2 is a transverse sect-ion taken in the plane indicated by line 2 2 ofFig. 1.

Referring by letter to the said drawings, A is a piston-cylinder, B apiston therein, and O a valve-chest which is connected by ports a withthe piston-cylinder adjacent to the opposite ends thereof and isprovided at an intermediate point of its length with an opening 12 forthe admission of carbonic-acid gas, steam, or other fluid-pressure. Thesaid chest 0 contains two bushings D, and its opposite ends areconnected by a conduit E with an exhaust F. The bushings are of a lessdiameter than the chest, so as to afford annular spaces 0 between themand said chest, and they have heads at at their inner ends and also havetwo sets of ports cf for connecting their interiors with the saidannular spaces, which are always in communication with the ports a. Thesaid ports 6 e at the inner ends of the bushings D are theinduction-ports and are in communication with the central steam-chest C,and the ports ff at the outer ends of the bushings are theeduction-ports of greater area than the ports e e and are incommunication with the exhaust-pipe F.

In the chest is a reciprocatory rod G and two piston-valves I-I, fixedthereon, the said valves being so arranged, as shown in Fig. 1, thatwhen one is in a position to effect communication between the interiorof the chest 0 and the cylinder A at one side of the piston B, so as toadmit fluid-pressure to said cylinder, the other efiects communicationbetween the piston-cylinder at the opposite side of the piston and theexhaust-conduit E, and

thereby exhaiists fluid-pressure f rom' the cyl inder.

In practice when the valve-rod is moved toward the right the right-handvalve II uncov ers the inner port 6 of its bushing and permitsfluid-pressure to pass from the interior of the chest through the porte, the righthand annular space 0, and the right-hand port a into thecylinder and drive the piston toward the left. The left hand valve Hmoves with the right-hand one, and as the latter uncovers the port 6 ofits bushing the former uncovers the portf of its bushing and permits thefluid-pressure at the left of the piston to pass out through left-handport a, left-hand annularspace c, left-hand portf, and conduit-E. Whenthe valve rod is moved toward the left, the operation described isrepeated, with the exception that the left-hand valve H effectscommunication between the interior of the chest and the interior of thecylinder, while the right-handvalve efiects communication between thatportion of the cylinder at the right of the piston and the eXhaust-conduit E.

From the foregoing construction and arrangement of the parts it will beseen that the use of packing-boxes in the steam-chest containing thehigh-pressure motive fluid is entirely avoided, the only sliding bearingfor the valverod G being in the exhaustpipe, and this may be simplyaguide ora packingboX, so looselypacked that butli ttle frictionalresistance is offered to the movement of the valve-rod, and it will alsobe observed that the valves H H are perfectly balanced.

Having thus described my invention, what I claim is- The combinationwith the cylinder and piston of a fluid-pressure engine, of a steamchesthaving ports or openings at its ends communicating with the ends of thecylinder, and a central chamber to which the motive fluid under pressureis supplied, valve-seat bushings fitted in the ends of the steam-chestformed to leave an annular space around them into which thecylinder-ports open, and each having a series of induction-ports at itsend adjacent to the central fluid-receiving chamber and a series ofeduction-ports at its outer end, pipe connections at the ends of thesteam-chest to place the eduction-ports in communication with a commonexhaust-pipe, In testimony whereof I have hereunto set a valve fitted toslide in each of the bushings, my hand in presence of two subscribingwitand an operating-rod connecting the valves nesses.

and passing through a bearing or packing box CHARLES D; P. GIBSON.formed or located in one of the pipes connect- Witnesses: ing the endsof the steam chest to the ex- O. O. BARKER,

haust-pipe. HENRY A. STEFFENS.

